Question

Assertion: In imbricate aestivation, out of five petals, one is completely internal, one is completely external and in each of the remaining three petals, one margin is internal and the other is external.
Reason: Ascending imbricate aestivation is found in Cassia and Gulmohur.
(a) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
(b) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
(c) Assertion is correct but Reason is incorrect.
(d) Both Assertion and Reason are incorrect.

Answer 1

Aestivation is the arrangement of the parts of the flower which is positional within a flower bud before the opening of the bud. It is also known as the prae foliation which is the arrangement of leaves within a vegetative bud.

Complete answer:
During imbricate aestivation, one petal is completely inside and the other petal is completely outside. it is divided into two types which include the descending imbricate and the ascending imbricate. The one petal or the sepal is internal in indicating aestivation or is overlapped on both the margins. The characteristics of aestivation are inactivity and lowered metabolic rate, dryness which are often in the summer months. the psychological state can be rapidly reversed in the organism which aestivates and appeared to be in the light state of dormancy. It helps in retaining the water in the body, conserves energy, and handles the nitrogenous end products which stabilize bodily organs, cells, and macromolecules.

Additional information:
Gulmohur is a flowering plant that is characterized by its ferns like leaves and the orange-red flowers over summer. It consists of large petals up to 8 cm long and an upright metal which is standard and is slightly larger with yellow and white spots. It appears at the end of the branches and turns dark brown and woody when young. Cassia is a flowering plant that consists of the largest species of legume and is known in systems of traditional medicine. It is of culinary use and some species are edible. The pods are stewed into molasses which are used as a sweetener and are of nutritional and medicinal use.

So, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion'.

Note:
Gulmohar is widely grown as a street tree for the umbrella-like canopy structure which consists of stunning flowers and is grown as an ornamental tree in several tropical parts of the world. It provides antidiabetic and antibacterial activities with some anti-inflammatory activities.